Unrated severityNVD Advisory· Published Jun 18, 2026· Updated Jun 18, 2026
Reflected XSS in UBB.threads
CVE-2026-54221
Description
UBB.threads is vulnerable to Reflected XSS. The application improperly handles user input in certain requests, enabling attackers to execute arbitrary JavaScript in the context of a victim's browser by tricking them into clicking a crafted link. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 7.7.5 but may also affect other versions.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <=7.7.5
Patches
Vulnerability mechanics
No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.
References
2- cert.pl/en/posts/2026/06/CVE-2026-54219mitrethird-party-advisory
- www.ubbcentral.commitreproduct
News mentions
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